Answer:
Disease, war, and possibly weakened government
Explanation:
Making treaties and delivering the mail
"The Huna People, also known as Huns, invaded Gupta territory and caused significant damage to the empire. The Gupta Empire ended in 550 CE, when it disintegrated into regional kingdoms after a series of weak rulers and invasions from the east, west, and north."
Constitution was submitted to the states for ratification
shays rebellion falls
constitutional convention opens in Philadelphia George Washington presiding